I don't know if this has anything to do with mountain climbing but I've decided to increase my core strength, whatever that is.
So I've begun two foolhardy programmes: 100 push ups and 200 sit ups .
It's a six week programme. Erm... so far I've only done one day and my arms are already sore from push ups. Sit-ups (or rather, curl ups) are easier for me, so no soreness yet, but I am probably speaking too soon.